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Salt herring has been a Polish staple since the medieval period — the Hanseatic League shipped Baltic herring inland from the 13th century, and the 40 days of Lent meant Catholic Poland needed fish for nearly six weeks each year. Soaking out the salt and re-marinating in oil with onion is the standard 19th-century preservation method that became permanent; on Christmas Eve, herring is one of the twelve obligatory Wigilia dishes.

Hanseatic League shipped Baltic salt herring inland from the 13th century; six weeks of Lent every year locked the fish into Polish kitchens for good. Salt-cured matjas-grade herring soaks in cold water or milk for 6–12 hours with two water changes — under-soaked tastes like brine, over-soaked goes mushy. Allspice, not black pepper, is the load-bearing aromatic.

Strips of salt-cured herring in a glass jar of sunflower oil with onion rings, bay leaf, allspice berries, and black peppercorns. Served cold on rye bread with butter, or as part of the Christmas Eve cold table. The herring is firm, oily, salty-tangy; the onion bites; the allspice gives a faint clove warmth. Standard Polish vodka companion.

Salt-cured herring (matjas-grade is best) must be soaked in cold water or milk for 6–12 hours before marinating, with the water changed twice — under-soaked herring tastes like brine, over-soaked goes mushy and flavorless. The oil-and-onion stage isn't really about flavor infusion; it's about sealing the fish from air so it keeps for weeks in the fridge. Allspice, not black pepper, is the load-bearing aromatic.